The ADPCH register determines which channel is connected to the sample and hold circuit.
There are several channel selections available as shown in the following selection table:
| ADPCH | ADC Positive Channel Input |
|---|---|
| 111111 | Fixed Voltage Reference (FVR)(2) |
| 111110 | DAC1 output(1) |
| 111101 | Temperature Indicator(3) |
| 111100 | AVSS (Analog Ground) |
| 100011-111000 | Reserved. No channel connected. |
| 110111 | RG7/ANG7 |
| 110110 | RG6/ANG6 |
| 110101 | RG5/ANG5 |
| 110100 | RG4/ANG4 |
| 110011 | RG3/ANG3 |
| 110010 | RG2/ANG2 |
| 110001 | RG1/ANG1 |
| 110000 | RG0/ANG0 |
| 101111 | RF7/ANF7 |
| 101110 | RF6/ANF6 |
| 101101 | RF5/ANF5 |
| 101100 | RF4/ANF4 |
| 101011 | RF3/ANF3 |
| 101010 | RF2/ANF2 |
| 101001 | RF1/ANF1 |
| 101000 | RF0/ANF0 |
| 100111 | RE7/ANE7 |
| 100110 | RE6/ANE6 |
| 100101 | RE5/ANE5 |
| 100100 | RE4/ANE4 |
| 100011 | RE3/ANE3 |
| 100010 | RE2/ANE2 |
| 100001 | RE1/ANE1 |
| 100000 | RE0/ANE0 |
| 011111 | RD7/AND7 |
| 011110 | RD6/AND6 |
| 011101 | RD5/AND5 |
| 011100 | RD4/AND4 |
| 011011 | RD3/AND3 |
| 011010 | RD2/AND2 |
| 011001 | RD1/AND1 |
| 011000 | RD0/AND0 |
| 010111-010000 | Reserved. No channel connected |
| 001111 | RB7/ANB7 |
| 001110 | RB6/ANB6 |
| 001101 | RB5/ANB5 |
| 001100 | RB4/ ANB4 |
| 001011 | RB3/ANB3 |
| 001010 | RB2/ ANB2 |
| 001001 | RB1/ ANB1 |
| 001000 | RB0/ANB0 |
| 000111 | RA7/ANA7 |
| 000110 | RA6/ANA6 |
| 000101 | RA5/ANA5 |
| 000100 | RA4/ ANA4 |
| 000011 | RA3/ ANA3 |
| 000010 | RA2/ ANA2 |
| 000001 | RA1/ ANA1 |
| 000000 | RA0/ANA0 |
When changing channels, a delay is required before starting the next conversion.
Refer to Section “ADC Operation” for more information.